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Abstract <p>Oxidation of complexes [(dpp-bian)M(THF)<sub><i>n</i></sub>] (M = Mg, <i>n</i> = 3; M = Ca, <i>n</i> = 4) with 1 molar equivalent of iodine and then a treatment of the in situ formed dpp-bian radical-anionic species [(dpp-bian)MI(THF)<sub><i>n</i></sub>] (M = Mg, Ca) with potassium isopropoxide afforded [(dpp-bian)Mg(O<i>i</i>Pr)]<sub>2</sub> and [(dpp-bian)Ca(O<i>i</i>Pr)(THF)][(dpp-BIAN)Ca(O<i>i</i>Pr)], which were isolated as deep red crystals and characterized by spectroscopic methods. Molecular structures of the prepared complexes were determined by the single crystal X-ray analysis. Polymerization of lactide in the presence of complexes was carried out in toluene under argon at 90°C for 2 h. In all the cases the conversion of monomer reached &gt;90%, the polydispersity indexes are relatively low and fall into narrow range, 1.50–1.72.</p>

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Ring-Opening Polymerization of Lactide in the Presence of Alkaline Earth Metal Complexes of a Redox-Active Ligand

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Alexander G. Morozov,
  • Valentin M. Makarov,
  • Konstantin A. Kozhanov,
  • Sergey Yu. Ketkov,
  • Igor L. Fedushkin

摘要

Abstract

Oxidation of complexes [(dpp-bian)M(THF)n] (M = Mg, n = 3; M = Ca, n = 4) with 1 molar equivalent of iodine and then a treatment of the in situ formed dpp-bian radical-anionic species [(dpp-bian)MI(THF)n] (M = Mg, Ca) with potassium isopropoxide afforded [(dpp-bian)Mg(OiPr)]2 and [(dpp-bian)Ca(OiPr)(THF)][(dpp-BIAN)Ca(OiPr)], which were isolated as deep red crystals and characterized by spectroscopic methods. Molecular structures of the prepared complexes were determined by the single crystal X-ray analysis. Polymerization of lactide in the presence of complexes was carried out in toluene under argon at 90°C for 2 h. In all the cases the conversion of monomer reached >90%, the polydispersity indexes are relatively low and fall into narrow range, 1.50–1.72.